[Presentation API] (browser side) Implement reconnect() for 1-UA mode

chrome/browser/media/router/offscreen_presentation_manager.cc

Index: chrome/browser/media/router/offscreen_presentation_manager.cc
diff --git a/chrome/browser/media/router/offscreen_presentation_manager.cc b/chrome/browser/media/router/offscreen_presentation_manager.cc
index 0e721ad4a3863a91a0454b1d440998d29b1cd42a..a73b9d8b28778ce8b6e46f4c7c519ee28599c7d6 100644
--- a/chrome/browser/media/router/offscreen_presentation_manager.cc
+++ b/chrome/browser/media/router/offscreen_presentation_manager.cc
@@ -90,6 +90,29 @@ void OffscreenPresentationManager::OnOffscreenPresentationReceiverTerminated(
   offscreen_presentations_.erase(presentation_id);
 }
 
+void OffscreenPresentationManager::RegisterOffscreenPresentationRoute(
+    const std::string& presentation_id,
+    const GURL& presentation_url,
+    const MediaRoute& route) {
+  auto* presentation =
+      GetOrCreateOffscreenPresentation(presentation_id, presentation_url);
+  presentation->RegisterRoute(route);
+}
+
+bool OffscreenPresentationManager::IsOffscreenPresentation(
+    const std::string& presentation_id) {
+  return base::ContainsKey(offscreen_presentations_, presentation_id);
+}
+
+const MediaRoute* OffscreenPresentationManager::GetRoute(
+    const std::string& presentation_id) {
+  auto it = offscreen_presentations_.find(presentation_id);
+  if (it == offscreen_presentations_.end())
+    return nullptr;
+
+  return it->second->route_.get();
+}
+
 // OffscreenPresentation implementation.
 OffscreenPresentationManager::OffscreenPresentation::OffscreenPresentation(
     const std::string& presentation_id,
@@ -134,6 +157,12 @@ void OffscreenPresentationManager::OffscreenPresentation::RegisterReceiver(
   pending_controllers_.clear();
 }
 
+void OffscreenPresentationManager::OffscreenPresentation::RegisterRoute(
+    const MediaRoute& route) {
+  DCHECK(!route_);
+  route_ = base::MakeUnique<MediaRoute>(route);

[mark a. foltz, 2017/03/01 06:26:32]

Is it important that this take ownership of the passed Route object or can it
make a copy?

[zhaobin, 2017/03/15 18:18:56]

Done.

[imcheng, 2017/03/16 01:42:51]

I thought this was a unique_ptr because there's a window of time when an
OffscreenPresentation is not associated with a MediaRoute yet (if receiver side
registered first). I don't think we should be default constructing MediaRoute.

[zhaobin, 2017/03/16 18:50:30]

Done.

+}
+
 bool OffscreenPresentationManager::OffscreenPresentation::IsValid() const {
   return !(pending_controllers_.empty() && receiver_callback_.is_null());
 }